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    <title>6.16. M4-1.4.4</title>
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        <h4>Linux From Scratch - 版本 6.2</h4>
        <h3>第六章 安装系统基础软件</h3>
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        <h1 class="sect1">6.16. M4-1.4.4</h1>
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        <p>M4 软件包包含一个宏处理器。</p>
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              <strong><span class="segtitle">预计编译时间：</span></strong> <span class="seg">少于 0.1 SBU</span>
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              <strong><span class="segtitle">所需磁盘空间：</span></strong> <span class="seg">3 MB</span>
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          <h2 class="sect2">6.16.1. 安装 M4</h2>
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        <p>为编译 M4 做准备：</p>
        <pre class="userinput"><kbd class="command">./configure --prefix=/usr</kbd></pre>
        <p>编译软件包：</p>
        <pre class="userinput"><kbd class="command">make</kbd></pre>
        <p>要测试结果，请运行：<strong class="userinput"><tt>make check</tt></strong> 。</p>
        <p>安装软件包：</p>
        <pre class="userinput"><kbd class="command">make install</kbd></pre>
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          <h2 class="sect2">6.16.2. M4 的内容</h2>
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              <strong><span class="segtitle">安装的程序：</span></strong> <span class="seg">m4</span>
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          <h3><a id="id3680338" name="id3680338"></a>简要描述</h3>
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                <td><a id="m4" name="m4"></a><span class="term"><span><strong class="command">m4</strong></span></span></td>
                <td><p>M4 能够将宏展开并将输入拷贝到输出。宏可以是内嵌的也可以是用户定义的，并且可以接受很多参数。除了展开宏，<span><strong class="command">m4</strong></span> 还有其它内置的功能，比如包含引用文件、运行 Unix 命令、进行整数运算、文本操作、循环等等。<span><strong class="command">m4</strong></span> 可以被用作一个编译器的前端或作为自身的一个宏处理程序。</p></td>
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